Outcrop or artificial surface exposure, Tonalite
| Geographic location |
-149.241667, 61.826667
149°
14'
30"
W,
61°
49'
36"
N
AK
Anchorage D-6
1:63,360 scale map quadrangle
Accurate to within 1 minute (~1 mile)
TALKEETNA MOUNTAINS REGION
|
|---|---|
| Source of sample | Outcrop or artificial surface exposure |
| Rock name | Tonalite |
| Laboratories | USGS Menlo Park |
| Compiler name | Marvin, R.F. |
| Date compiled | 1984 11 |
| Precision of location | Accurate to within 1 minute (~1 mile) |
| Location comment | TALKEETNA MOUNTAINS REGION |
| Bibliographic reference | Csejtey, B., Jr., Nelson, W.H., Jones, D.L., Silberling, N.J., Dean, R.M., Morris, M.S., Lanphere, M.A., Smith, J.G., and Silberman, M.L., 1978, Reconnaissance Geologic Map and Geochronology, Talkeetna Mountains Quadrangle, Northern Part Of Anchorage Quadrangle, and Southwest Corner Of Healy Quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-558-A, 62p. Reconnaissance Geologic Map and Geochronology, Talkeetna Mountains Quadrangle, Northern Part Of Anchorage Quadrangle, and Southwest Corner Of Healy Quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-558-A, 60p. |
| (click for info) | |
| Geologic map unit | -149.241667, 61.826667 |
| Nearby scientific data | Find additional scientific data near this location |
| Age estimate | 73.1 ± 2.2Ma age of intrusion
|
|---|---|
| Type of analysis | conventional K-Ar |
| Rock or mineral analyzed | hornblende |
| Analytical details | |
| Lab sample ID | 28. (60ACZ40) |
| Decay constants | 4.962E-04, 0.581E-04, 1.1167E-04 |
| K2O concentration | 0.759 % |
| Radiogenic 40Ar concentration | 0.8153 |
| Radiogenic Ar | 74 % |